especially among newcomers who already feel like they "missed the train."

You generalize too much. There are many types of "newcomers":

• those that until today, they totally ignored Bitcoin, no matter how many times you told them about - Ignorance is a bliss.
• those that hate Bitcoin - lost souls
• chronic shitcoiners - they will always live with a guilt
• busy people that hadn't had time to learn about Bitcoin, but still want to - there's a chance but really small segment
• clueless NPC - these will never learn about Bitcoin because are too stupid and brainwashed

For all these I have a message: https://postimg.cc/d7Qp4JgK

And if you feel that "guilt" it's ON YOU !